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2 Sheets-Sheet 1- McCOY. Hot Air Furnace.

Pate nted Aug; 23, 1870.

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Hot Air Furnace. 010000700. 0 7 V Patented Aug. 23', 1070.

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John MCCOY, on BURLINGTON, NEW .innsnr. AssIcNon TO HIMSELF AND cannon srovn COMPANY.

v Ee tters la-tent No. 106,708, dated August 23, 1870.

HOT-AIR FURNACE.

The Schedule referred to in these Letters Patent and making part of the same To all whom 'it may concern:

Be it known that I, J OHN M0001, of Burlington city and county, in the State of New Jersey, have invented certain new and useful Improvements in Heating Furnaces; and I he eby declare the following to be a full and exact description thereof, reference being had to the accompanying drawing forming part of this specification.

The nature or essence of my invention consists in an improved method of constructing and arranging certain parts of a heating furnace, as will be fully set forth in the description and claims here followin In the drawing hereiubefore mentioned Figure 1, sheet 1, is a front elevation of fire-pot and connected parts,

Figure 2, a vertical section of the same, taken at right angles to the view in fi 1 Figure 3, sheet 2, is a front view of the surrounding ease, shown in section in figs. 1' and 2; and

Figure 4 is an elevation of drums and pipes arranged outside the above-mentioned case.

The cast-iron flre-potA is provided with a grate, .A', and surmounted by the drums B, of which there may be such a number as may he thoughtdesirable.

The one next above A I use as a combustionchainher, and cast on its' lower edge two flanges, o, a short-distance apart, to fit corresponding flanges on the top of the tire-pot A, so as to form at this point a circular air-chamber or. hollow space around the contracted neck or top of the tire-pot.

These flanges 0 maybe short, as shown in the drawing, admitting only one or two rows of air-openings through the inner flange, or extended in height sutiiciently to admit of the introduction of all the air that may he'found necessary for a thorough ignition of'the' combustible gases that may pass through the contracted neck of the furnace.

The top of the fire-pot A is contracted, for the especial purpose of compelling the gases-that may arise from the fuel to pass in contact with air that is introduced through the perforated wall that incloses the neck or throat of the furnace, formed, as stated, by the inner flange 0.

The circular chamber or hollow space formed by concentric walls or flanges, as stated, is supplied with air by the pipes C, and perforations or notches are made in the inner flange or wall of the furnace neck, as shown at 'r, so as to allow the air to pass freely into the neck of the furnace, to aidthe complete combustion of the products from the burning fuel below.

The drums B are made of much larger diameter at the middle part than at the top and bot-tom, as shown, and are each cast whole, or in one piece, the construction heretofore employed in casting them in two or more pieces, and connecting them by bolts or rivets,

having been found objectionable, as the alternate conit in close conta t therewith, instead of allowing it to pass up chiefly through the center of the drums. In this way the drums are more efficiently heated.

The drums B and fire-pot A are surrounded by a case, E, preferably of gal 'auized sheet-iron, to the interior of which are attachedhorizontal deflectors F, which project into the recesses formed by the peculiar shape ot'the fire-pot and drums, as shown.

The air to be heated being admitted into the bottom of the case IE, it is compelled, in rising, to follow the zigzag course of the exterior of the lire-pot and drums, and to pass over every part of their exterior surface. and in close contact with it.

In this way a much greater amount of heat is communicated to the rising current than if it was allowed to pass up free, as in that case much the larger portion of it would not enter these recesses at all.

To increase the heating surface I arrange within the brick chamber containing the drums 13, indicated on fig. 4, by dotted lines at E, the vertical drums G, outside the ease E, and connect them with *ach other by the horizontal drums or pipes H, and to the drums B by the smoke or draught-flue I, which is to be provided with a suitable valve'i'or closing or stopping the direct draught, and compelling it to pass through these outer drums. p

The openings on the horizontal drums H, as ata and a, are provided with double flanges, the lower edge of the vertical drums Gr being set between the inner and outer flange, as in the case ot'tihe drums B, and shown at s, fig. 2, and the tops of the drums G are provided with similar double flanges, by means of which they are connected with the pipes leading into or out oft-hem, as shown at s, 4.

These flanges are filled with sand, to make a tight joint, and this arrangement and form or method of connection has the important advantage that the.

drums and pipes can be set up or taken down by a servant .or common laborer without the assistance of a skilled workman. I v

' The pipes H are made to extend through the wall of the brick'chamher, and provided with .a-removable stopper, so as to be readily cleaned out from the outside, and the drums B may be provided with a clean.

out pipe, L, arranged in like manner, and provided with a stopper, .N.

When inelosed in a brick ehamber, the ease E will of course, be open at the top, but by covering it, as shown in figs. 1, 2, and 3, an efiieient portable furnaee will be formed, the heated air being conveyed to its destination by a pipe or pipes, J; or, ifit be desirable to keep the heat in as much as possible, there may be two cases, an outer one with cover on it, as shown in the figures just referred to, and an inner one open at the top, as shown in fig. 4, with the deflectors F attached to it.

I claim as my invention 1. The combination, with a series of drums, B, of the horizontaldeflectors 1*, attached to a surrounding case, and arranged to project into the recesses formed by the drums, substantially as described.

both, substantially as and for the purpose set forth.

The fire-pot A, with its contracted top, in combination with a neck or throat more or less elongated, and having around it an 'air-ohamber with aperforated inner wall, substantially as and for the purpose specified.

4. The combination andarrangement of the firepot A, drums B, ease E, supporting the deflectors F, and the outer radiating drums G and H. to form a heating furnace, substantially as herein set forth.

' .JOHN MCCOY;

Witnesses: a

J no. CHUROBMAN, J. M. ROBERTS. 

